[BOOKKEEPER-717] journal should look forward to group time-out entries

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.3.0
• Component/s: bookkeeper-server
• Assignee: Sijie Guo
• Reporter: Sijie Guo
• Created: 31/Dec/13 12:05
• Updated: 07/Mar/14 16:35
• Resolved: 07/Mar/14 16:16

Description

journal should look a bit forward to group timeout entries, which avoid too much fsyncs with single entry impacting journal performance. so bookie could have sustained high throughput with low-latency.